The Azores archipelago (Portugal) contains 88 lakes, two located inside caves spread across six of the nine volcanic islands of the archipelago; the formation of the lakes is associated with various types of volcanic structures. Surveys were performed on 45 water bodies corresponding to a representative data set and omitting only small ephemeral ponds to extensively research CO₂ emissions from the volcanic lakes.

The modified accumulation chamber method was used to measure the CO₂ flux at the surface of the lakes; 16,119 measurements were performed with flux values ranging from 0 to 20,960 g m⁻² d⁻¹. Graphical statistical approaches identified different geochemical populations from the CO₂ flux data. Multiple populations associated with limnological and biogenic processes or volcanic/hydrothermal sources were identified in some cases. The influence of these sources was also confirmed by the determined δ¹³C content of the lakes.

The lakes of the Azores emit approximately ~171 × 10³ t yr⁻¹ of CO₂ into the atmosphere; much of this is released by the Furnas and Furna do Enxofre lakes, both showing mantle-derived CO₂ origin. Deep-seated CO₂ accounts for approximately 42% of the total degassing.

亚速尔群岛（葡萄牙）有 88 个湖泊，其中两个位于洞穴内，分布在群岛九个火山岛中的六个岛上；湖泊的形成与各种类型的火山结构有关。对与代表性数据集相对应的 45 个水体进行了调查，仅省略了小型临时池塘，以广泛研究火山湖的CO ₂排放。

改进的聚积室法用于测量湖泊表面的CO ₂通量；进行了 16,119 次测量，通量值范围为 0 至 20,960 g m ^-2  d ^-1。图形统计方法从 CO ₂通量数据中确定了不同的地球化学种群。在某些情况下，确定了与湖沼学和生物成因过程或火山/热液来源相关的多个种群。这些来源的影响也通过确定的湖泊δ ¹³ C 含量得到证实。

亚速尔群岛的湖泊向大气排放大约 ~171 × 10 ³  t yr ^-1的 CO ₂；其中大部分是由 Furnas 和 Furna do Enxofre 湖释放的，两者都显示出地幔衍生的 CO ₂来源。深层CO ₂约占总脱气量的42%。